Squashed 'l1/' content from commit 670aa58

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app/repositories/__init__.py

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+"""
+L1 Server Repositories.
+
+Data access layer for persistence operations.
+"""
+
+# TODO: Implement repositories
+# - RunRepository - Redis-backed run storage
+# - RecipeRepository - Redis-backed recipe storage
+# - CacheRepository - Filesystem + PostgreSQL cache metadata